Jack-screw.



No. 69|,06L Patented lan. I4, |902.

G. L. & s. w. M. KoLLocK.

JAC'K SCREW.

(Application filed Apr. 23, 1901.)

(No Model.)

IINTTEE STaTEs GEORGE L. KOLLOCK AND SAMUEL W'. M. KOLLOCK, OE SEATTLE wPATENT @Tirion 1WASIIINGrTOhT.

JACKHSCREW.

SEEGliFGATlE/@N forming part of Letters Patent No. 691,661, dated January 14, 1902. Applicatidn led April 23, 1901. Serial No. 57,096. (No model.)

T0 all whom it may concern.-

Be it known that we, GEORGE L. KoLLooK and SAMUEL W. M. KoLLooK, citizens of the United States,residiugat Seattle,in the county of King and State of Vashington, have invented certain new and useful Improvements in Jack-Screws, of which the following is a specification.

Our invention relates to improvements in jack-screws; and among nu merous objects attained thereby and readily understood from the accompanying drawings and following specification are simple and eiiicient means for raising and lowering the screw, like means for raising a load when resting at the base of the jack, and preferred structural features incidental to the embodiment of the objects.

With reference to the drawings, included as a part of the specification, Figure 1 is a perspective View ofthe jack with the screw slightly advanced. Fig. 2 is a transverse section of same on line b '7, Fig. 1. Fig. 3 is a plan view of the ratchet-lever, with one arm removed to disclose the pawls and the ratchetnut. Fig. 4 is a broken elevation of the jack, disclosing modified means fordriving the nut; and Fig. 5 is a diametrical section of the nut.

Like characters of reference designate corresponding parts throughoutthe several views of the drawings.

In the present embodiment the reference character Aindicates the stand; B, the screw; C, the nut; D, the ratchet-lever, and E a two-part head for the screw.

The screw B comprises a suitable bar convenientlyformed with asquare screw-thread,

y as in the ordinary manner, and having its lower extremity conveniently formed for the attachment of a foot, as a. This footis firmly iixed to the screw and extends laterally therefrom with suitable projections from the side of the stand A and is preferably formed with a head, as 142, having a groove, as Z), extended across each side face and adapted to slidably embrace guides d, placed longitudinally the stand A, thereby holding the foot slidably rigid, relieving the screw of cross-strain, and holding it from turning with the nut. The foot is also preferably formed with'an angular bottom surface 16, which renders the toe thereof wedge-shaped and permits the foot to be more readily worked under objects resting at the base of the jack.

As now considered, the stand A is made with a suitable head h, a longitudinally-extended recess, as f, in one side face, and suitable apertured lugs 10 at the base, which are placed for convenience in fastening the jack by suitable stays, and a suitable handle 12 is fixed adjacent the top for obvious purposes. The recess f extends to the bottom of the stand and is adapted to receive the screw B and head of the foot a, and the guides d are conveniently fixed longitudinally the side walls thereof, so as to engage with the grooves in the head of the foot a, and said head is preferably made to also slidably t against the back wall of the recess to more rigidly position the foot, as indicated in Fig. 2.

The head of the stand A is conveniently provided with a suitable concentric aperture through which the screw B works as promoted by operations of the nut C, which is formed with suitable screw-threads fitting the thread of the screw and is supported upon the head h by a suitable ball-bearing of any ordinary or desired construction adapted to reduce frictional resistance.

In the preferred embodiment the nut C is conveniently formed with suitable ratchetteeth on its periphery and with hubs, as 14, which adapt it for movement by the ratchetlever D. This lever is suitably bifurcated at the inner end to embrace the nut, and each furcation is provided with a suitable aperture to fit it to a hub 14, whereby the lever is adapted to move about the nut during its return movement, as in ordinary ratchet contrivances of like class.

Between the furcations of the lever D are conveniently pivoted right and left pawls, as 7i: and 7o', which are suitably spring-pressed to engage the teeth on the nut c in the ordinary manner and have extended Shanks, as

15, whereby either one can be forced against' spring-pressure and made to lie from engagement with the teeth on the nut, and thereby adapt the lever for rotating the nut in either direction, as determined by the setting of the pawls. The pawls are conveniently and expeditiously set by means of a yoke, as f, which is fixed to an operable pivot 20, conveniently IOO jonrnaled in the lever to canse the yoke to embrace the extremities l of the pawls. This pivot is extended beyond the upper face of the lever and bent to afford a handle 2l, by which the yoke is manipulated to set the pawls, and a lock-pin, as 22, is removably seated in the lever at desired points tO conveniently sccure the position of the yoke when turned to hold either pawl from the nut.

In the present instance the pawls 7s and 7c are suitably pressed to engage the teeth on the nut C by means of independent fiatA springs, as 13 and 17, resting between the pawls and liXed by one end to the lever and pressing with their free ends upon the eX- tremities of the respective pawls as opposed to movement of the pawls by the yoke F.

Fig. 4 indicates modified means for impelling the nut C to action by a force applied at right angles toits movement, and consists ofa modified form of nnt D, having its periphery conforming to that of a bevel-pinion and a driver thereof comprising a bevel-wheel G, which is journaled tO the frame A by a suitable pivot, as g, and carries a handle, as 23, bywhich it is made to rotate the nut rapidly and continuously.

The head E of the screw consists of twO parts, as and 26, the former being suitably fixed to the end of the screw, and its upper surface is made substantially level, as in ordinary practice, While the latter is detachably mounted on the former in any suitable manner and is formed with a concave upper surface to adapt it for lifting shafts, axles, and the like.

lt will be understood that the foot a is adapted for exerting force at points where it would be impossible to use the head E, as it can be brought to the bottom of the stand A,

I and thereby engage with the objects resting on the same surface by tilt-ing the jack slightly, as permitted by the angular surface 1G at the toe of the foot, and working the foot under the Object, when the jack is returned and the nut rotated to lift the load.

A jack-screw thus produced is simple and positive in operation, powerful in action, and adapted for applying force in various'ways not covered by the ordinary jack. Furthermore, the ratchet contrivance embodied with the lever is exceedingly simple and inexpensive and yeasily adjusted to reverse the travel of the nut. n

Having thus described our invention, what we claim, and desire to secure by Letters Patent Of the United States, is

In a jack-screw, the combination Of a stand having a longitudinal recess, a head and guides, a foot having a screw and ahead with grooves to receive said guides, a nut on said screw and supported by the head of the stand, and having ratchetteeth and hubs upon opposite sides thereof, a ratchet-leverbifurcated and having. portions embracing said hubs, pawls mounted in the bifurcation of the lever, a yoke pivoted in the bifurcation of the lever to engage said pawls, the pivot of the yoke being extended to form a handle, and a lock-pin removably inserted in the lever for cooperation with said handle, all substantially as shown and described. y

In testimony whereof we aix our signatures in presence of two witnesses.

GEO. L. KOLLOCK. SAMUEL WV. M. KOLLOCK.

Witnesses:

JOHN E. CARROLL, GEORGE P. SCHURTZ. 

